Claims
- 1. A method of manufacturing a heat exchanger assembly including solderless tube-to-tube joints comprising the steps of assembling a subassembly including a plurality of fins in parallel stacked relationship for defining heat transfer surfaces and a plurality of fluid-carrying tubes extending transversely through said fins for defining a fluid circuit, said subassembly including at least one tube end requiring connection to the end of another tube, providing a tube end on one of said tubes with an annular outwardly extending shoulder followed by an inwardly tapered portion and at least one outwardly extending projection on said inwardly tapered tube end immediately adjacent said shoulder, providing the tube end of the other of said tubes with an outwardly flared portion having an internal size capable of receiving said inwardly tapered portion, the length of said flared portion being slightly greater than the length of said inwardly tapered portion, assembling said tubes by inserting said inwardly tapered portion into said outwardly flared portion until the end of said outwardly flared portion extends beyond said shoulder and mechanically clinching the end of said outwardly flared portion over said shoulder and forcibly wedging said tapered portion tightly into said flared portion by forming an inwardly extending flange surrounding said projection thereby joining said tubes together to prevent relative rotation between said tubes.
- 2. The method set forth in claim 1 including the step of locating an annular sealing member on the exterior surface of said inwardly tapered portion.
- 3. The method set forth in claim 1 including the step of applying a layer of sealing material to one of the mating surfaces of said tube ends.
Parent Case Info
This application is a divisional of Application Ser. No. 818,434, filed July 25, 1977, and now U.S. Pat. No. 4,172,946.
US Referenced Citations (4)
Foreign Referenced Citations (3)
Number |
Date |
Country |
648920 |
Aug 1937 |
DE2 |
1194349 |
Jun 1965 |
DEX |
64980 |
Jul 1925 |
SEX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
818434 |
Jul 1977 |
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